diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/kernel/vdso.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/kernel/vdso.c | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/ANDROID_3.4.5/arch/s390/kernel/vdso.c b/ANDROID_3.4.5/arch/s390/kernel/vdso.c deleted file mode 100644 index ea5590fd..00000000 --- a/ANDROID_3.4.5/arch/s390/kernel/vdso.c +++ /dev/null @@ -1,333 +0,0 @@ -/* - * vdso setup for s390 - * - * Copyright IBM Corp. 2008 - * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License (version 2 only) - * as published by the Free Software Foundation. - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/smp.h> -#include <linux/stddef.h> -#include <linux/unistd.h> -#include <linux/slab.h> -#include <linux/user.h> -#include <linux/elf.h> -#include <linux/security.h> -#include <linux/bootmem.h> -#include <linux/compat.h> -#include <asm/asm-offsets.h> -#include <asm/pgtable.h> -#include <asm/processor.h> -#include <asm/mmu.h> -#include <asm/mmu_context.h> -#include <asm/sections.h> -#include <asm/vdso.h> -#include <asm/facility.h> - -#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) -extern char vdso32_start, vdso32_end; -static void *vdso32_kbase = &vdso32_start; -static unsigned int vdso32_pages; -static struct page **vdso32_pagelist; -#endif - -#ifdef CONFIG_64BIT -extern char vdso64_start, vdso64_end; -static void *vdso64_kbase = &vdso64_start; -static unsigned int vdso64_pages; -static struct page **vdso64_pagelist; -#endif /* CONFIG_64BIT */ - -/* - * Should the kernel map a VDSO page into processes and pass its - * address down to glibc upon exec()? - */ -unsigned int __read_mostly vdso_enabled = 1; - -static int __init vdso_setup(char *s) -{ - unsigned long val; - int rc; - - rc = 0; - if (strncmp(s, "on", 3) == 0) - vdso_enabled = 1; - else if (strncmp(s, "off", 4) == 0) - vdso_enabled = 0; - else { - rc = strict_strtoul(s, 0, &val); - vdso_enabled = rc ? 0 : !!val; - } - return !rc; -} -__setup("vdso=", vdso_setup); - -/* - * The vdso data page - */ -static union { - struct vdso_data data; - u8 page[PAGE_SIZE]; -} vdso_data_store __page_aligned_data; -struct vdso_data *vdso_data = &vdso_data_store.data; - -/* - * Setup vdso data page. - */ -static void vdso_init_data(struct vdso_data *vd) -{ - vd->ectg_available = user_mode != HOME_SPACE_MODE && test_facility(31); -} - -#ifdef CONFIG_64BIT -/* - * Allocate/free per cpu vdso data. - */ -#define SEGMENT_ORDER 2 - -int vdso_alloc_per_cpu(struct _lowcore *lowcore) -{ - unsigned long segment_table, page_table, page_frame; - u32 *psal, *aste; - int i; - - lowcore->vdso_per_cpu_data = __LC_PASTE; - - if (user_mode == HOME_SPACE_MODE || !vdso_enabled) - return 0; - - segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER); - page_table = get_zeroed_page(GFP_KERNEL | GFP_DMA); - page_frame = get_zeroed_page(GFP_KERNEL); - if (!segment_table || !page_table || !page_frame) - goto out; - - clear_table((unsigned long *) segment_table, _SEGMENT_ENTRY_EMPTY, - PAGE_SIZE << SEGMENT_ORDER); - clear_table((unsigned long *) page_table, _PAGE_TYPE_EMPTY, - 256*sizeof(unsigned long)); - - *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table; - *(unsigned long *) page_table = _PAGE_RO + page_frame; - - psal = (u32 *) (page_table + 256*sizeof(unsigned long)); - aste = psal + 32; - - for (i = 4; i < 32; i += 4) - psal[i] = 0x80000000; - - lowcore->paste[4] = (u32)(addr_t) psal; - psal[0] = 0x20000000; - psal[2] = (u32)(addr_t) aste; - *(unsigned long *) (aste + 2) = segment_table + - _ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT; - aste[4] = (u32)(addr_t) psal; - lowcore->vdso_per_cpu_data = page_frame; - - return 0; - -out: - free_page(page_frame); - free_page(page_table); - free_pages(segment_table, SEGMENT_ORDER); - return -ENOMEM; -} - -void vdso_free_per_cpu(struct _lowcore *lowcore) -{ - unsigned long segment_table, page_table, page_frame; - u32 *psal, *aste; - - if (user_mode == HOME_SPACE_MODE || !vdso_enabled) - return; - - psal = (u32 *)(addr_t) lowcore->paste[4]; - aste = (u32 *)(addr_t) psal[2]; - segment_table = *(unsigned long *)(aste + 2) & PAGE_MASK; - page_table = *(unsigned long *) segment_table; - page_frame = *(unsigned long *) page_table; - - free_page(page_frame); - free_page(page_table); - free_pages(segment_table, SEGMENT_ORDER); -} - -static void vdso_init_cr5(void) -{ - unsigned long cr5; - - if (user_mode == HOME_SPACE_MODE || !vdso_enabled) - return; - cr5 = offsetof(struct _lowcore, paste); - __ctl_load(cr5, 5, 5); -} -#endif /* CONFIG_64BIT */ - -/* - * This is called from binfmt_elf, we create the special vma for the - * vDSO and insert it into the mm struct tree - */ -int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) -{ - struct mm_struct *mm = current->mm; - struct page **vdso_pagelist; - unsigned long vdso_pages; - unsigned long vdso_base; - int rc; - - if (!vdso_enabled) - return 0; - /* - * Only map the vdso for dynamically linked elf binaries. - */ - if (!uses_interp) - return 0; - -#ifdef CONFIG_64BIT - vdso_pagelist = vdso64_pagelist; - vdso_pages = vdso64_pages; -#ifdef CONFIG_COMPAT - if (is_compat_task()) { - vdso_pagelist = vdso32_pagelist; - vdso_pages = vdso32_pages; - } -#endif -#else - vdso_pagelist = vdso32_pagelist; - vdso_pages = vdso32_pages; -#endif - - /* - * vDSO has a problem and was disabled, just don't "enable" it for - * the process - */ - if (vdso_pages == 0) - return 0; - - current->mm->context.vdso_base = 0; - - /* - * pick a base address for the vDSO in process space. We try to put - * it at vdso_base which is the "natural" base for it, but we might - * fail and end up putting it elsewhere. - */ - down_write(&mm->mmap_sem); - vdso_base = get_unmapped_area(NULL, 0, vdso_pages << PAGE_SHIFT, 0, 0); - if (IS_ERR_VALUE(vdso_base)) { - rc = vdso_base; - goto out_up; - } - - /* - * Put vDSO base into mm struct. We need to do this before calling - * install_special_mapping or the perf counter mmap tracking code - * will fail to recognise it as a vDSO (since arch_vma_name fails). - */ - current->mm->context.vdso_base = vdso_base; - - /* - * our vma flags don't have VM_WRITE so by default, the process - * isn't allowed to write those pages. - * gdb can break that with ptrace interface, and thus trigger COW - * on those pages but it's then your responsibility to never do that - * on the "data" page of the vDSO or you'll stop getting kernel - * updates and your nice userland gettimeofday will be totally dead. - * It's fine to use that for setting breakpoints in the vDSO code - * pages though. - */ - rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT, - VM_READ|VM_EXEC| - VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, - vdso_pagelist); - if (rc) - current->mm->context.vdso_base = 0; -out_up: - up_write(&mm->mmap_sem); - return rc; -} - -const char *arch_vma_name(struct vm_area_struct *vma) -{ - if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base) - return "[vdso]"; - return NULL; -} - -static int __init vdso_init(void) -{ - int i; - - if (!vdso_enabled) - return 0; - vdso_init_data(vdso_data); -#if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) - /* Calculate the size of the 32 bit vDSO */ - vdso32_pages = ((&vdso32_end - &vdso32_start - + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1; - - /* Make sure pages are in the correct state */ - vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 1), - GFP_KERNEL); - BUG_ON(vdso32_pagelist == NULL); - for (i = 0; i < vdso32_pages - 1; i++) { - struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); - get_page(pg); - vdso32_pagelist[i] = pg; - } - vdso32_pagelist[vdso32_pages - 1] = virt_to_page(vdso_data); - vdso32_pagelist[vdso32_pages] = NULL; -#endif - -#ifdef CONFIG_64BIT - /* Calculate the size of the 64 bit vDSO */ - vdso64_pages = ((&vdso64_end - &vdso64_start - + PAGE_SIZE - 1) >> PAGE_SHIFT) + 1; - - /* Make sure pages are in the correct state */ - vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 1), - GFP_KERNEL); - BUG_ON(vdso64_pagelist == NULL); - for (i = 0; i < vdso64_pages - 1; i++) { - struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE); - ClearPageReserved(pg); - get_page(pg); - vdso64_pagelist[i] = pg; - } - vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data); - vdso64_pagelist[vdso64_pages] = NULL; - if (vdso_alloc_per_cpu(&S390_lowcore)) - BUG(); - vdso_init_cr5(); -#endif /* CONFIG_64BIT */ - - get_page(virt_to_page(vdso_data)); - - smp_wmb(); - - return 0; -} -early_initcall(vdso_init); - -int in_gate_area_no_mm(unsigned long addr) -{ - return 0; -} - -int in_gate_area(struct mm_struct *mm, unsigned long addr) -{ - return 0; -} - -struct vm_area_struct *get_gate_vma(struct mm_struct *mm) -{ - return NULL; -} |